This book was the best explanation of Relativity that I could find. I have had passed experience with a college course and two other books (Relativity: The Special and the General Theory and A Briefer History of Time). I found that this book gave good mental pictures for the reader to understand the theories. The book did not just come at the topic at one angle, it would tackle the subject from different sides. If and when I would think of a contradiction of one of the theories, the book would in the next section be explaining why that exact contradiction was not a contradiction. The book does not contain any of the math evolved in the theories, but I would say that it would be a good companion book to a more advanced college text book over Relativity. I would recommend this book for beginning Physicist or one who is interested in learning the theory of Relativity and/or its consequences.